Spring



(No Model.)

H. O. CHASE.

SPRING.

No. 582,412. Patented May 11, 1897.

2 9% we as UNITED STATES PATENT EEicE.

HARRISON OTIS CHASE, OF SAN FRANCISCO, CALIFORNIA.

SPRING.

SPECIFICATION forming part of Letters Patent No. 582,412, dated May 1 1, 1897.

Application filed September 1, 1896. Serial No. 604,523. (No model.)

To all whom it may concern:

Be it known that I, HARRISON OTIS CHASE, a citizen of the United States, residing at San Francisco, in the county of San Francisco and State of California, have invented certain new and useful Improvements in Springs; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention relates to coiled springs for various uses, including the support of bedbottoms, seats, and other structures where an elastic support is necessary or desirable.

The object of my invention is toproduce a spring composed of two coiled members connected together for use and which possesses particular advantages over a coil formed of a single member. The coils, being separately made in conical shape,can be nested for transportation, thus saving considerable room, and then assembled and secured together. The coils secured together are so braced and supported as to retain for a longer time the symmetrical shape given them in manufacture, and hence give a more permanent and even support to the structure which rests upon them. Further, the coils, being separate, can be made from wire of different gages, which renders the spring self-adjusting to different weights.

The construction in which I prefer to embody my invention, so as to insure these advantages among others, is fully hereinafter described, and is shown in the accompanying drawings, in which- Figure 1 is a side elevation of a double spring composed of two members, each having two coils and secured together at the center, showing one embodiment of my invention. Fig. 2 is a similar elevation showing a spring composed of two members, each having a single coil and connected at the center in the same manner as shown in Fig. 1. Fig. 3 is a cross-section at thej unction of the two springs of Fig. 1, but with the connecting devices separated. Fig. 4 is a similar view with the connecting devices secured together. Fig. 5 is a plan view of Fig. 4:. Fig. 6 represents a modification in the connecting devices. Fig. 7 is a side view of the same.

My springs are in all cases composed of two coiled members A and B, secured together at their free ends, either directly or by means of a separate connecting and securing device. Figs. 1 and 2 show different ways of composing the springs, the difference between them lying in the fact that in Fig. 1 each member A or B has a double coi1,while the same members in Fig. 2 have single coils. By having each spring formed of two members in the cone shape shown the members separately manufactured can be nested for shipment, and thus save considerable room in transportation. WVhen ready for use for a bed, seat, or any other structure to be made elastic, the two members are assembled and so secured together at their smaller diameters.

A is a plate stamped or otherwise formed out of sheet metal into circular form. It is made with a depression 1, surrounding a central opening 2, and is provided with an upturned rim 4 and flange 5. An opening 6 is formed at one side of the plate, which opening extends through the rim 4. The end of a single coil, Fig. 2, or both ends of a double coil, Figs. 1 and 3, extend through this opening (the latter in opposite directions) and lie beneath the plate in the space between the rim 4, the depressed portion of the plate, and a flanged washer 7, having a central opening, and which, in connection with the plate A, forms a receptacle for the wire. This plate forms the female part of the connection. The corresponding male part B is similarly constructed to receive the coil or coils of the other member 13 of the spring, but is provided with a central rivet, stud, or eyelet 8, which enters the opening 2 and is turned down over its edge, Fig. 4., securing the two members firmly together and forming an inclosure for all the coils at that point. It also stiffens the complete spring against side and torsional strains and so tends to keep it symmetrical and perpendicular-that is to say, in its proper shape. For these reasons the effective life of the spring is prolonged and the structure or surface supported elastically by it is kept level and even for a much longer time than by the use of ordinary non-reinforced coils.

These springs may be used separately, either singly or in numbers, or, if desired, a number of them can be connected together, especially where a structure of considerable extent is to be supported. To provide for this, I may provide integral lugs 9, formed integrally with the plates A and B and projecting from their edges, as shown in Figs. 6 and 7. These lugs are adapted to receive and hold bands, strips, wires, or other connections which could be used to connect a series or number of springs to any desired extent, so that the whole elastic support will be tied and braced together in a simple and convenient way.

By making each spring of two coiled memhers I am able to use wire of different gages for the upper and lower part, as illustrated in Fig. 1. As there shown the coil B, which is supposed to be the lower coil, is of heavier wire than the upper coil A. By these means I provide alight and easy spring at the point where the weight is directly applied, combined with a heavier base-spring of greater resistance. The whole spring therefore acts more uniformly under diiferent weights and is really self-adjustin g to all of such weights from the partial compression of the light spring to the complete compression of the combined springs.

Having thus described my'invention, what I claim as new, and desire to secure by Letters Patent, is

1. A spring composed of two independent coiled members of differential tension relatively to each other in combination with a separate fastening device for connecting such coils together.

2. A spring composed of two independent coils each composed of Wire of a gage different from the gage of the wire composing the other, and connected together, substantially as described.

3. A spring composed of two separate coils in combination with plates for inclosing and holding the ends of said coils, and means for securing said plates together, substantially as described.

at. A spring composed of two separate coils of differential tension relatively to each other in combination with plates for inclosin g the ends of said coils, and means for securing said plates together, substantially as described.

5. A spring composed of two separate coils in combination with sheet-metal plates having upturned rims and flanges, and provided with openings to admit the ends of the coils, and means for securing said plates together, substantially as described.

6. A spring composed of two separate coils, in combination with a fastening device, consisting of a female member having upturned rim and flange and a central opening, and a male member having upturned rim and flange and a central hollowrivet, said members being secured together, substantially as described.

7. In combination with two coiled members of a spring, a fastening device for connecting thesame together, composed of separate plates each having an upturned rim and flange, to partly inclose the ends of one of the said coils, a washer'tocomplete the i'nclosnre, and means for securing said plates together, substantially as described.

8. In combination with a coil-spring, a device for holding and securing'the end thereof, consisting of a plate, having an upturned flanged rim and a central opening, a side opening, through which the coil extends, and a washer, all forming a complete inclosure for the end of the coil, substantially as described.

9. In combination with a coil-spring composed of two members, secured together by connected plates secured to the ends of said members, lugs projecting from said connected plates, substantially as described and shown.

In testimony whereof I have affixed my signature, in presenceof two witnesses, this 25th day of August, 1896.

HARRISON OTIS CHASE.

\Vitnesses:

L. W. SEELY, J. S. WALKER. 

